public void Reset()
{
//default box size
box = new Shapes.Rectangle(0, 0, 0)
{
Width = 200, Height = 200,
videoProcessing = this,
pointMode = Shapes.PointMode.ScreenUnzoomed
};
// Draws
s.DrawCross = (IsUpCamera()) ? false : true;
s.DrawDashedCross = false;
// Finds:
s.FindCircles = false;
s.FindRectangles = false;
s.FindComponent = false;
s.TakeSnapshot = false;
s.TestAlgorithm = false;
s.Draw_Snapshot = false;
s.DrawBox = false;
s.FindFiducial = false;
s.Draw1mmGrid = false;
MarkA.Clear();
MarkB.Clear();
Arrows.Clear();
}
public static List <Shapes.Rectangle> FindRectangles(VideoProcessing vp, Bitmap frame)
{
List <Shapes.Rectangle> rects = new List <Shapes.Rectangle>();
using (Image <Bgr, Byte> img = new Image <Bgr, byte>(frame)) {
// double cannyThresholdLinking = 120.0;
// double cannyThreshold = 180.0;
//Convert the image to grayscale and filter out the noise
Image <Gray, Byte> gray = img.Convert <Gray, Byte>().PyrDown().PyrUp();
//Image<Gray, Byte> cannyEdges = gray.Canny(cannyThreshold, cannyThresholdLinking);
using (MemStorage storage = new MemStorage()) { //allocate storage for contour approximation
Contour <System.Drawing.Point> contours = gray.FindContours(CHAIN_APPROX_METHOD.CV_CHAIN_APPROX_SIMPLE, RETR_TYPE.CV_RETR_LIST, storage);
for (; contours != null; contours = contours.HNext)
{
Contour <System.Drawing.Point> currentContour = contours.ApproxPoly(contours.Perimeter * 0.05, storage);
if (currentContour.Area > 250) //only consider contours with area greater than 250
{
if (currentContour.Total == 4) //The contour has 4 vertices.
{
#region determine if all the angles in the contour are within [80, 100] degree
bool isRectangle = true;
System.Drawing.Point[] pts = currentContour.ToArray();
LineSegment2D[] edges = PointCollection.PolyLine(pts, true);
for (int i = 0; i < edges.Length; i++)
{
double angle = Math.Abs(edges[(i + 1) % edges.Length].GetExteriorAngleDegree(edges[i]));
if (angle < 80 || angle > 100)
{
isRectangle = false;
break;
}
}
#endregion
if (isRectangle)
{
var box = currentContour.GetMinAreaRect();
Shapes.Rectangle r = new Shapes.Rectangle(box.center.X, box.center.Y, box.angle);
r.Height = box.size.Height;
r.Width = box.size.Width;
rects.Add(r);
}
}
}
}
}
}
//ensure we dont have massive rectangles
rects = rects.Where(x => (x.Height < .8 * vp.FrameSize.Height && x.Width < .8 * vp.FrameSize.Width)).ToList();
SetVideoProcessing(rects, vp);
return(rects);
}
public static PointF[] ToRotatedRectangle(Shapes.Rectangle s)
{
s.ToRawResolution();
PointF[] p = new PointF[5];
p[0].X = (float)s.Left; p[0].Y = (float)s.Top;
p[1].X = (float)s.Right; p[1].Y = (float)s.Top;
p[2].X = (float)s.Right; p[2].Y = (float)s.Bottom;
p[3].X = (float)s.Left; p[3].Y = (float)s.Bottom;
p[4].X = (float)s.Left; p[4].Y = (float)s.Top;
// roate about center
double angle = s.A * Math.PI / 180d;
PartLocation center = new PartLocation(s);
for (int i = 0; i < p.Length; i++)
{
PartLocation pp = new PartLocation(p[i]) - center; //shift to zero
pp = pp.Rotate(angle) + center;
p[i] = pp.ToPointF();
}
return(p);
}
public void Reset()
{
//default box size
box = new Shapes.Rectangle(0, 0, 0) {
Width = 200, Height = 200,
videoProcessing=this,
pointMode = Shapes.PointMode.ScreenUnzoomed
};
// Draws
s.DrawCross = (IsUpCamera()) ? false : true;
s.DrawDashedCross = false;
// Finds:
s.FindCircles = false;
s.FindRectangles = false;
s.FindComponent = false;
s.TakeSnapshot = false;
s.TestAlgorithm = false;
s.Draw_Snapshot = false;
s.DrawBox = false;
s.FindFiducial = false;
s.Draw1mmGrid = false;
MarkA.Clear();
MarkB.Clear();
Arrows.Clear();
}
private static void DrawRectangle(ref Bitmap image, Shapes.Rectangle rectangle)
{
using (Graphics g = Graphics.FromImage(image)) {
g.DrawLines(new Pen(Color.Red), ToRotatedRectangle(rectangle));
}
}
